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R, STEINBAOH. BALL MILL.

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UNITED. STATES 5 FFICEe PATENT! REINHOLD STEINBAQH, OF MAGDEBURG-BUCKAU, GERMANY, ASSIGNOR TO THE FRIED. K-RUPP GRUSONWERK, OF SAME PLACE.

BALL-MILL.

SPECIFICATION forming part of Letters Patent No. 603,977, dated May 10, 1898.

Application filed December 21, 1896. Serial No. 616,561. (No model.) Patented in England November 23,

To all whom} it may concern:

Be it known that I, REINHOLD SrnINnAoH,

termined according to the fineness to which it is desired to reduce the material to be crushed or ground. Now sieves or sifting-frames of this class are very liable to become obstructed or clogged when a high degree of fineness has to be attained. The serviceableness of the mill is thereby impaired and the difficulty of obtaining a fine product is increased.

The present invention relates to a ball-mill consisting of a horizontal cylinder or conical drum having a number of vertical chambers or compartments wherein the material by being continuously passed through the mill is reduced to any required degree of fineness from that of coarse grit to that of dust without the aid of sifting-frames.

The mill mainly consists of a cylindrical or conical drum which is divided into two or more compartments by means of vertical par titions arranged at right angles Each compartment is partly filled with balls. The first compartment communicates with the second one by peripheral apertures or slots provided in the partition at points close to the casing of the drum, while communication is established between the second and third compartments by perforations at or near the center of the second partition. The said compartments thus centrally and circumferentially in alternate succession communicate with each other.

The material, which has undergone a preparatory grinding process in another mill to reduce the particles thereof to a suitable size, is, by means of controllable feeding appara to its axis.

tus, introduced through the center of one of the side walls of the drum into the first compartment or chamber. The said material descends between the balls (by which it is further ground) to the casing of the revolving drum, and thence, through the peripheral apertures or slots provided for the purpose, passes into the next chamber. The reduced particles behave somewhat like a fluid and rise between the balls of the second chamber until they reach the same level as the layer of material in the first chamber, and-in so doing they are further gradually reduced. Before, however, they reach that level they come up to the perforations in the center of the second partition and through them flow into the third chamber. In this and the following chambers, if any, the same process is repeated. Thus the material in traveling through the mill from the inlet to the outlet takes a serpentine or Winding course and eventually leaves the last chamber through the outlet provided in the center of the end wall of the drum in the desired fine condition.

When it is desired to vary the degree of fineness of the ground material--for example, to change from a coarser to a finer productinstead of, (as has been necessary in the or dinary ball-mills heretofore employed) changing the sifting frames, and reducing the charge of material accordingly, all that is required in the case of this improved mill is to reduce the rate of feed of the material by properly adjusting or setting the feeding mechanism in such a manner that the material takes more time to travel from one compartment to the next, remains longer in contact with the grinding-surfaces of the balls, and is consequently ground to a greater degree of fineness.

A ball-mill constructed in accordance with this invention is shown, by way of example, in Figures 1 and 2 of the accompanying drawings, which are respectively longitudinal and transverse sections of the same.

The said mill consists of a horizontal drum a, with vertical end Walls a and divided by a vertical partition or two or more vertical partitions b, arranged at'right angles to its axis. These partitions divide the drum intoa corresponding number of vertical compartments filled with balls or spherical castings-of steel or other hard material. The end walls are provided with hollow pivots or trunnions, one of which, (1, serves as an inlet and the other of which, e, serves as an outlet. The inlet pivot or trunnion turns in an ordinary bearing f, while the outlet pivot or trunnion rests upon rollers g. The drum receives motion through the belt-pulleys It, shaft 2', and pinion is, which engages-with an annular rack or toothed ring Z, secured to the drum. The grits to be crushed are supplied by means of a controllable: feeding, device of'any suitable construction: In the drawings a. conveyorscrew'having an increasing pitch from one end. tothe other is shown, by' way of exam:- ple, for thispurpose. The entrance to the outlet-is fitted internally with a. cylindrical wide-meshed sieve m, theobjectofi whichisto keeplthe balls from-.droppingxout of the; drum. Within and secured atuthesinner end of this sifting-cylinder isa conemt'heapex of which projects outward into the outer trunnion; The said cone serves to deflect the finematerial whichis carried up by the end wall and sie-veand which falls therefrom through the sieve or, in other words, this sievecarries at its inner end a conen, with its point directed outwardly, and' this cone serves to deflect the finer material, which is taken up in great quantities by the sidewalls and thesieveand which again falls from aboveinto the sieve. If the sievewere closed bymeansof aflat plate instead of: the cone, then' this material would fallallthe Way through-the sieveand again enter the-lower part ofthe drum. The cone, however, intercepts this material and conducts it toward the escape; It is obvious therefore that with: this cone more material per hour will pass through. the-outlet than without the cone. Thepartitions b have, as

above stated, a number of apertures or slots 19 of any suitable shape at their periphery and perforations p at or near the center, and through these apertures or slots and perforations the material is enabled to pass from one chamber to the other,.as previously described. The size of these apertures is such that the balls will not pass through them. By the above-described means the material is compelled to travel through the mill in the direction indicated by the arrows in Fig. 1.

When hard materials are to be dealt with, both the drum-walls and the partitions may be provided with exchangeable plates of correspondingly hard materi'ah assuggest-ed in the drawings.

I claim 1. A ball-millcomprisin g a cylind ermounted'v upon: a horizontal axis, and having. end walls provided respectively'with an inlet and a. hollow-trunnion outlet said outlet having secured: at its inner end:a.cylindricalwidemeshed sieve: and a conesecured within and at the inner end. of the sieve and projecting into the hollow-trunnionoutlet substantially as and for the purpose: set forth.

2-. A ball-mill comprising a horizontalrcylinder having end'wallszprovided respectively, with inlet and outlet hollow trunnions, the cylindrical wide-meshed sieve secured to the inner end of the'outlet hollow trunni'omthe cone secured within and at the inner end of thesieve. and projecting into the; outlet hollow trunnion, the vertical partitions. having peripheral apertures or slots, a vertical part'ition'having'perforations'at or near its centerand located between the first-named partitions and means for'rotating' the cylinder; the partitions providing vertical ball com partments; substantially as described;

The foregoing specification signed'atMagdeburg this23d day of November, 1896'.

REINHOLD STEINBAGH In presence of-.-

JULIUS MUTH, M. O. MUTH. 

